Date:         Sat, 12 Aug 2000 01:44:15 PDT
Reply-To:     Mark Dorm <mark_hb@hotmail.com>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mark Dorm <mark_hb@hotmail.com>
Subject:      Re: Slick 50 for Manual transmissions
Comments: To: mcalvin@ican.net
Content-Type: text/plain; format=flowed

Put your teflon coated frypan on a burner with water or oil or food in it
and turn the burner on full blast and let it go... just remember to wear a
gas mask because the result is toxic -- after the the PTFE has burned up add
some motor oil to the pan and add your best friends collection of rare and
precious coins to the pan and proceed to cook the coins for forty hours in
the mixture of oil and burnt PTFE. Let me know how it goes. If you start to
hear a whiney noise from your best friend, turn the heat up and see if it
goes away.

>In previous threads on this topic the chemically inclined answered that
>PTFE
>breaks down at high temperatures to form highly corrosive acids which then
>damage the metal it is supposed to protect.  So, while there is a
>noticeable
>benefit at first, there is a terrible end result.  The breakdown temp is
>somewhere around 400 degrees Fahrenheit I think.  While the oil is not at
>that
>temperature all the time the cylinder walls are often hotter and the PTFE
>is
>being applied to them and washed off again with every stroke of the piston.
>The corrosive by-products build up in the oil and damage everything it
>touches.
>
>Search the archives if you want to know more, that's all I remember.
>
>Miguel
>
>Andrew Grebneff wrote:
> >
> > If your transmission is
> > >wining on acceleration, it has either a scorched bearing, or a scorched
> > >gear, or many of both.
> >
> > A worn differential may also whine under load.
> >
> > My 095 trans suffered a collapsed mainshaft bearing; this did not quite
> > make what you'd call a whine, but made a lower-pitched moan.
> >
> > Regarding teflon (PTFE), this is a plastic which has the lowest
>coefficient
> > of friction known to man, I believe, and is also extremely resistant to
> > heat (witness its use in Dupont coatings on nonstick frypans etc). But
>it
> > is not all that hard, a bit like nylon. Surely, when minute particles of
> > teflon are introduced to restricted spaces and squeezed between metal
> > surfaces at high pressures (eg within bearings, between piston and
>cylinder
> > wall etc), some of this material would be rubbed into the surface
> > irregularities in the metal? This SHOULD produce something of an
>incomplete
> > and very slippery coating, though this wouls eventually wear away.
>Whether
> > such a coating would be capable of giving a measurable, much less
> > noticable, improvement in performance or fuel-efficiency is doubtful.
>But I
> > cannot see how it should be able to cause harm (though I'm no expert
>here).
> >
> > Andrew
>
>--
>A. Miguel Calvin
>mcalvin@ican.net
>Guelph, Ontario, Canada
>83.5 1.9l Westy

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